main.cpp

00001 #define APP_VERSION     0.6f
00002 #define MQTT_VERSION    3
00003 #define BROKER_NAME     "broker.hivemq.com"
00004 #define BROKER_PORT     1883
00005 
00006 #include "debounce_button.h"
00007 #include "EthernetInterface.h"
00008 #include "MQTTNetwork.h"
00009 #include "MQTTmbed.h"
00010 #include "MQTTClient.h"
00011 
00012 char* topic = "dansvloerVincent/votes";
00013 volatile bool button1_pressed = false;   // Used in the main loop
00014 volatile bool button1_enabled = true;   // Used for debouncing
00015 volatile int multiclick_state = 0;   // Counts how many clicks occured in the time slot, used in main loop
00016 volatile bool button1_busy = false;      // Informs the mainloop that the user is clicking the button
00017 
00018 /**
00019     TODO
00020     ----
00021     -   Check if the button has been pressed. If so, print the amount of clicks to a serial terminal.
00022     -   Make an MQTT-service which:
00023         -   starts up a network using EthernetInterface. Make sure the development board requests its address via DHCP.
00024         -   makes a client and connects it to the broker using a client ID and credentials (username & password).
00025         -   sends messages at the same topic as the smartphone app from PGO 2. Feel free to choose which Quality of Service
00026             you are going to use. Make a separate function which handles the sending procedure. Therefore, this function
00027             can be called each time we want to send a certain message.
00028     -   When the button is pressed once, we send an upvote. When pressed twice, a downvote is sent. By pressing 4 times,
00029         the program disconnects from the broker and terminates.
00030         
00031     Extra
00032     -----
00033     -   Subscribe to the topic on which the song data is published. Display this received message on the serial terminal.
00034     -   Test this controller in the complete system of PGO 2. Use these controllers instead of the smartphones.
00035     
00036     Tips & tricks
00037     -------------
00038     -   To generate an interrupt on the press of a button, use:
00039             InterruptIn button(USER_BUTTON);
00040             ...
00041             button.fall(callback(someFunction));
00042     -   Before implementing MQTT, test the multiclick feature first.
00043     -   Have a look at the MQTT-library for Mbed and the HelloMQTT-example.
00044     -   To have a uniform message sending procedure, use the following function usage:
00045             sendMessage(&client, topic, buf, qos, retained, duplicate)
00046 */
00047 
00048 int main(int argc, char* argv[])
00049 {
00050     printf("Vote controller booting...\n");
00051     int rc;
00052     
00053     InterruptIn button(USER_BUTTON);
00054     button.fall(&button1_onpressed_cb);
00055     
00056     EthernetInterface eth;
00057     eth.connect();
00058     const char *ip = eth.get_ip_address();
00059     printf("IP address is: %s\n", ip ? ip : "No IP");
00060     
00061     NetworkInterface *net = ð
00062     MQTTNetwork mqtt( net );
00063     
00064     MQTT::Client<MQTTNetwork, Countdown> client( mqtt );
00065     
00066     char *host = "143.129.39.151";//"broker.mqttdashboard.com";
00067     int port = 1883;
00068     rc = mqtt.connect(host, port);
00069     if (rc != 0)
00070         printf("rc from TCP connect is %d\n", rc);
00071     
00072     
00073     
00074     MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
00075     data.MQTTVersion = MQTT_VERSION;
00076     data.clientID.cstring = "VincentController";
00077     data.username.cstring = "smartcity";
00078     data.password.cstring = "smartcity";
00079     if ((rc = client.connect(data)) != 0)
00080         printf("rc from MQTT connect is %d\n", rc);
00081     
00082     MQTT::Message message;
00083     message.qos = MQTT::QOS1;
00084     printf("Start clicking\n");
00085     char buf[100];
00086     
00087     while( multiclick_state < 4 )
00088     {
00089         // Keep running
00090         
00091         
00092         if(!button1_busy && multiclick_state > 0)
00093         {
00094             //printf("%d\n", multiclick_state);
00095             if(multiclick_state == 1)
00096                 sprintf(buf, "like\n");
00097             else
00098                 //buf = "dislike\n";
00099                 sprintf(buf, "dislike\n");
00100             multiclick_state = 0;
00101             
00102             printf("%s\n", buf);
00103             message.payload = (void *)buf;
00104             message.payloadlen = strlen(buf) + 1;
00105             client.publish(topic, message);
00106         }
00107         
00108         
00109         //printf("%d\n", multiclick_state);
00110     }
00111     
00112     
00113     
00114     if ((rc = client.disconnect()) != 0)
00115         printf("rc from disconnect was %d\n", rc);
00116     mqtt.disconnect();
00117     
00118     printf("Terminate...\n");
00119 
00120     return 0;
00121 }